CRDs with multiple version on OpenShift

console.md

$ kubectl get crd | grep crontab
crontabs.example.com                                                     2019-04-05T21:33:36Z

$ kubectl get crontab
NAME      AGE
new-tab   6m
old-tab   5m

$ kubectl get crontab old-tab -o yaml
apiVersion: example.com/v1
kind: CronTab
metadata:
  creationTimestamp: "2019-04-05T21:39:26Z"
  generation: 1
  name: old-tab
  namespace: myproject
  resourceVersion: "72559"
  selfLink: /apis/example.com/v1/namespaces/myproject/crontabs/old-tab
  uid: 48e28ce5-57eb-11e9-8d23-962951681228
spec:
  host: localhost
  port: 8080
  
$ kubectl get crontab new-tab -o yaml
apiVersion: example.com/v1
kind: CronTab
metadata:
  creationTimestamp: "2019-04-05T21:38:35Z"
  generation: 1
  name: new-tab
  namespace: myproject
  resourceVersion: "72162"
  selfLink: /apis/example.com/v1/namespaces/myproject/crontabs/new-tab
  uid: 2ac6df7b-57eb-11e9-8d23-962951681228
spec:
  hostPort: localhost:8080

crontab-crd.yml

apiVersion: apiextensions.k8s.io/v1beta1
kind: CustomResourceDefinition
metadata:
  name: crontabs.example.com
spec:
  versions:
  - name: v1beta1
    served: true
    storage: true
    schema:
      openAPIV3Schema:
        properties:
          hostPort:
            type: string
  - name: v1
    served: true
    storage: false
    schema:
      openAPIV3Schema:
        properties:
          host:
            type: string
          port:
            type: string
  conversion:
    # No conversion
    strategy: None
  scope: Namespaced
  names:
    plural: crontabs
    singular: crontab
    kind: CronTab

new-tab.yml

apiVersion: example.com/v1beta1
kind: CronTab
metadata:
  name: new-tab
spec: 
  hostPort: localhost:8080

old-tab.yml

apiVersion: example.com/v1
kind: CronTab
metadata:
  name: old-tab
spec: 
  host: localhost
  port: 8080